Naughty Dog's unannounced/cancelled game?

Naughty Dog is hard at work fleshing out the kinks of Uncharted 3, but this may not be the only project they are/were working on. There might be more than meets the eye as seen here.

We found Matt Mullin's resume (The guy who played Johnny Cage in Mortal Kombat: Legacy) who did the motion capture for Uncharted : Drake's fortune and Uncharted 3 was also involved for a game titled 'Thing 1" for Naughty Dog. This could be a codename for another project the company is currently involved in or was a game which got cancelled.